5Pcs HC-05 Wireless bluetooth Serial Transceiver Module
A part of the review has been auto-translated.
the bluetooth modules I received are zs-h040 HC-05. the modules HC-05 and HC-06 use the same board but have substantial differences. HC-06 does not have a switch button which in HC-05 is for module configuration. HC-06 has only 4 PIns unlike HC-05 which has 6 PIns. HC-06 can only work as a slave and therefore can only accept connections. HC-05 can also initialize the connection with other device. Note: since the bluetooth communicates in serial, when you go to load the sketch from the computer to Arduino, it is necessary that the PIn RX0 and TX1 are free to avoid conflicts. if the PIns are occupied by the bluetooth module there will be an error that will not allow the correct conclusion of the operation
Works very well